#include <stdio.h>

int main()
{
    perror("error!!!!");
    //fprintf(stdout, "Hello fprintf stdout\n");
    //fprintf(stderr, "Hello fprintf stderr\n");
    //fprintf(stdout, "Hello fprintf stdout\n");
    //fprintf(stderr, "Hello fprintf stderr\n");
    //fprintf(stdout, "Hello fprintf stdout\n");
    //fprintf(stderr, "Hello fprintf stderr\n");
    //fprintf(stdout, "Hello fprintf stdout\n");
    //fprintf(stderr, "Hello fprintf stderr\n");

    return 0;
}
